February 2012
Intermediate to advanced
752 pages
20h 7m
English
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3
Linear-light and perceptual uniformity
Each pixel value in a greyscale image represents what is loosely called brightness. However, brightness is defined formally as the attribute of a visual sensation according to which an area appears to emit more or less light. This definition is obviously subjective: Brightness can’t be measured, so is an inappropriate metric for image data. Also, according to colour appearance theory, brightness has no top end: Brightness is not relative to anything.
Intensity is radiant power in a particular direction,that is, power per unit solid angle [W·sr−2]; radiance is intensity per unit projected area. These terms disregard wavelength composition, but in colour imaging, wavelength is important! Neither of these ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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